Answer / Shivam Agarwal

A thread pool in Java is a collection of threads that are reused to handle multiple tasks efficiently. An ExecutorService, such as Executors.newFixedThreadPool(int n), creates a thread pool with a fixed number of threads. Here's an example:
```
ExecutorService executor = Executors.newFixedThreadPool(5);
for (int i = 0; i < 10; i++) {
final int taskId = i;
Runnable worker = new Runnable() {
public void run() {
System.out.println("Task " + taskId);
}
};
executor.execute(worker);
}
executor.shutdown();
```

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